Importance

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Abstract

An interactive cable network for sending information to, and receiving information from a plurality of subscribers. The information is sent from a head-end through a central distributor which includes a plurality of head-end modems each capable of transmitting information at respective transmit frequencies within a first range of frequencies, and receiving information at respective receive frequencies within a second range of frequencies. The respective transmit and receive frequencies for each head-end modem form a respective modem frequency pair. Each head-end modem is coupled to a group of user modems and each respective user modem of each group operates on the respective modem frequency pair of its respective head-end modem. The central distributor also interrogates each user modem within each group of user modems. Each head-end modem can detect the reception quality of the signals coming from its respective user modems and if the quality of said signals is insufficient can determine a new modem frequency pair to be used with its respective group of user modems.

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First Claim